EP3588232B1 - Optimizing and controlling the energy comsumption of a building - Google Patents
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- EP3588232B1 EP3588232B1 EP19192616.1A EP19192616A EP3588232B1 EP 3588232 B1 EP3588232 B1 EP 3588232B1 EP 19192616 A EP19192616 A EP 19192616A EP 3588232 B1 EP3588232 B1 EP 3588232B1
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- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
- G05B13/0205—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric not using a model or a simulator of the controlled system
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Description
- The technology relates generally to optimizing and controlling the energy consumption of a building.
- Weather is the largest variable impacting home energy demand. Many homes are equipped with a standard thermostat to regulate heating and cooling, where the occupant either manually adjusts the temperature to account for weather conditions or the thermostat automatically adjusts temperature based on a predetermined schedule. The automatic adjustment of temperature may be conducted by a utility that provides power to the home, but often such adjustments are based on incomplete or inaccurate weather information for the precise location of the home and do not factor in the occupant's personal preferences. In addition, these systems are generally not capable of accounting for the thermal characteristics of the particular building in which the thermostat is installed.
- As a result, such systems react to current weather conditions and temperature needs of the home, rather than performing pre-heating and/or pre-cooling based on forecast weather conditions and the energy characteristics of the home.
WO2011/072332 describes a HVAC control system and method. - The techniques described herein relate to optimizing energy use of a building (e.g., home) by dynamically controlling the thermostat of the building to pre-heat and/or pre-cool the building in response to local weather forecast conditions and when a demand response event is anticipated. In addition, the techniques provide the advantage of maintaining a desired comfort level for occupants of the building while encouraging efficient energy usage and monitoring.
- In one aspect, the invention features a method for optimizing and controlling the energy consumption of a building. A first computing device generates a set of thermal response coefficients for the building based on energy characteristics of the building and weather data associated with the location of the building. The first computing device predicts an energy response of the building based on the set of thermal response coefficients and forecasted weather associated with the location of the building. The first computing device selects minimal energy requirements of the building based on an energy consumption cost associated with the building. The first computing device determines one or more temperature set points for the building based on the energy response and the minimal energy requirements. The first computing device transmits the one or more temperature set points to a thermostat of the building.
- In another aspect, the invention features a system for optimizing and controlling the energy consumption of a building. The system includes a first computing device configured to generate a set of thermal response coefficients for the building based on energy characteristics of the building and weather data associated with the location of the building. The first computing device is configured to predict an energy response of the building based on the set of thermal response coefficients and forecasted weather associated with the location of the building. The first computing device is configured to select minimal energy requirements based on an energy consumption cost associated with the building. The first computing device is configured to determine one or more temperature set points for the building based on the energy response and the minimal energy requirements. The first computing device is configured to transmit the one or more temperature set points to a thermostat of the building.
- In another aspect, the invention features a computer program product, tangibly embodied in a non-transitory computer readable storage medium, for optimizing and controlling the energy consumption of a building. The computer program product includes instructions operable to cause a data processing apparatus to generate a set of thermal response coefficients for the building based on energy characteristics of the building and weather data associated with the location of the building. The computer program product includes instructions operable to cause a data processing apparatus to predict an energy response of the building based on the set of thermal response coefficients and forecasted weather associated with the location of the building. The computer program product includes instructions operable to cause a data processing apparatus to select minimal energy requirements based on an energy consumption cost associated with the building. The computer program product includes instructions operable to cause a data processing apparatus to determine one or more temperature set points for the building based on the energy response and the minimal energy requirements. The computer program product includes instructions operable to cause a data processing apparatus to transmit the one or more temperature set points to a thermostat of the building.
- In another aspect, the invention features a system for optimizing and controlling the energy consumption of a building. The system includes means for generating a set of thermal response coefficients for the building based on energy characteristics of the building and weather data associated with the location of the building. The system includes means for predicting an energy response of the building based on the set of thermal response coefficients and forecasted weather associated with the location of the building. The system includes means for selecting minimal energy requirements of the building based on an energy consumption cost associated with the building. The system includes means for determining one or more temperature set points for the building based on the energy response and the minimal energy requirements. The system includes means for transmitting the one or more temperature set points to a thermostat of the building.
- In another aspect, the invention features a method for computing the stored energy in a building. A first computing device determines a price for energy available to be supplied to the building. The first computing device generates a set of thermal response coefficients for the building based on energy characteristics of the building and weather data associated with the location of the building. The first computing device predicts an energy response of the building based on the set of thermal response coefficients and forecasted weather associated with the location of the building. The first computing device selects minimal energy requirements of the building based on an energy consumption cost associated with the building. The first computing device determines one or more temperature set points for the building based on the energy response and the minimal energy requirements. The first computing device transmits the one or more temperature set points to a thermostat of the building.
- Any of the above aspects can include one or more of the following features. In some embodiments, generating the set of thermal response coefficients is further based on physical data of the building. In some embodiments, the physical data includes at least one of: thermal mass, wind infiltration, relative area of windows, amount of insulation, wind infiltration of the building, material of construction, and efficiency of an associated HVAC system. In some embodiments, the predicted energy response is ranked based on predetermined criteria.
- In some embodiments, predicting an energy response is further based on the energy consumption cost associated with the building. In some embodiments, the energy consumption cost represents an amount of power required to change a temperature of the building for various external temperatures. In some embodiments, the energy characteristics comprise an indoor temperature of the building and a status of an HVAC system in the building, wherein the HVAC system includes one or more stage heating or cooling units.
- In some embodiments, the minimal energy requirements comprise a power consumption amount of an HVAC system in the building and a duty cycle of the HVAC system. In some embodiments, determining one or more temperature set points is further based on weather forecast data, a comfort preference provided by an occupant of the building, or both. In some embodiments, the first computing device transmits the predicted energy response to a remote computing device for display to a user. In some embodiments, the remote computing device receives a temperature preference based on input provided by the user.
- In some embodiments, the one or more temperature set points transmitted to the thermostat comprise a schedule for control of the thermostat over a period of time. In some embodiments, the first computing device receives the weather data from a network of remote sensors. In some embodiments, the weather data is received in real time.
- In some embodiments, the first computing device receives the thermostat data from a device connected to an HVAC system inside the building. In some embodiments, the thermostat data is received at predetermined time intervals. In some embodiments, the thermostat data is received in real time.
- In some embodiments, the first computing device adjusts the generated set of thermal response coefficients for error correction. In some embodiments, the adjusting includes filtering anomalies from the generated set of thermal response coefficients. In some embodiments, the weather data includes current weather conditions at the location of the building, forecast weather conditions for the location of the building, solar load at the location of the building, or any combination thereof.
- In some embodiments, the first computing device compares the predicted energy response of the building to a predicted energy response of one or more other buildings, and the first computing device ranks the predicted energy response of the building based on the comparison.
- In some embodiments, the selected optimal energy requirements are based on at least a comfort preference provided by an occupant of the building, a second computing device determines one or more temperature set points that change the energy response of the building to use less energy and diverge from the comfort preference; and the second computing device transmits the determined temperature set points to the thermostat of the building. In some embodiments, the second computing device is operated by an energy provider. In some embodiments, the first computing device and the second computing device are the same.
- In some embodiments, an amount of energy saved by changing the energy response of the building to use less energy is determined. In some embodiments, the amount of energy saved is translated into a corresponding energy consumption cost.
- In some embodiments, the first computing device determines a price for energy available to be supplied to the building, determines an amount of stored energy associated with the building based on the energy response and the minimal energy requirements, and transmits an energy consumption action to the thermostat of the building based on the amount of stored energy and the price for energy. In some embodiments, the amount of stored energy is determined at different points during a given time period.
- In some embodiments, generating a set of thermal response coefficients for the building is further based on smart meter data. In some embodiments, the use of temperature-affecting devices in the building is controlled based on the one or more temperature set points received by the thermostat. In some embodiments, the temperature-affecting devices include fans, humidifiers, and light shades.
- Other aspects and advantages of the invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating the principles of the invention by way of example only.
- The advantages of the invention described above, together with further advantages, may be better understood by referring to the following description taken in conjunction with the accompanying drawings. The drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.
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FIG. 1 is a block diagram of a system for optimizing and controlling the energy consumption of a building. -
FIG. 2 is a detailed block diagram of a server computing device for optimizing and controlling the energy consumption of a building. -
FIG. 3 is a flow diagram of a method for optimizing and controlling the energy consumption of a building. -
FIG. 4 is a diagram showing power usage and temperature readings as determined by predictions of the system in comparison to actual power usage and temperature readings. -
FIG. 1 is a block diagram of asystem 100 for optimizing and controlling the energy consumption of a building. Thesystem 100 includes aserver computing device 102, acommunications network 104, athermostat device 106 that controls the heating and/or cooling apparatus for a building, and aclient computing device 108. Theserver computing device 102 receives data from external sources (e.g., weather data, thermostat data) and determines energy response characteristics and energy requirements for a particular building. Theserver computing device 102 determines a temperature set point for the building, and transmits the set point to thethermostat 106 via thenetwork 104 so that the thermostat can adjust the heating/cooling conditions of the building appropriately. Theserver computing device 102 also interfaces with aclient computing device 108 via thenetwork 104 to provide a portal (e.g., a web browser interface) through which a user can view the energy response characteristics and energy requirements for a building (e.g., the user's house). The user can also, for example, manually adjust the temperature set points for thethermostat 106, and set up a comfort profile with the user's heating/cooling preferences so theserver computing device 102 can automatically adjust thethermostat 106 based on the comfort profile. -
FIG. 2 is a detailed block diagram of theserver computing device 102 for optimizing and controlling the energy consumption of a building. Theserver computing device 102 includes adata receiving module 202, adata storage 204, acoefficient modeler 206, apredictive outcome module 208, an optimization andscheduling module 210, adata verification module 212, a sendingmodule 214, and aweb interface module 216. It should be appreciated that, althoughFIG. 2 shows the components (e.g., 202, 204, 206, 208, 210, 212, 214 and 216) as within a singleserver computing device 102, in some embodiments the components are distributed on different physical devices without departing from the spirit or scope of the invention. Also, in embodiments where the components are distributed on different physical devices, those devices can reside at the same physical location or may be dispersed to different physical locations. - The
data receiving module 202 provides an interface between external data sources (e.g., weather databases, energy providers and building thermostats) and thedata storage 204 of theserver computing device 102. Thedata receiving module 202 receives data associated with atmospheric conditions and weather from various external data collection and/or monitoring systems (e.g., NWS, NOAA, Earth Networks Weather Network). Other sources of information include, but are not limited to, governmental agencies and third-party private companies. The atmospheric conditions and weather data can include, but is not limited to, current conditions information, forecast information and weather alert information. The atmospheric conditions and weather data can be categorized by location (e.g., zip code or GPS coordinates). Thedata receiving module 202 communicates with the various external data systems and sources via standard communications networks and methods. - The
data receiving module 202 also receives information from thermostat devices (e.g., thermostat 106) that are located within buildings and that control the heating and/or cooling apparatuses for the buildings. For example, thethermostat 106 transmits characteristics about its current operation status (e.g., current temperature setting, heating mode, cooling mode, power settings, efficiency conditions) to theserver computing device 102. In some embodiments, thedata receiving module 202 also gathers information from a smart meter (e.g., electric meter, gas meter, or water meter) located at the building. The smart meter is configured to record consumption of energy in predetermined intervals (e.g., one hour) and communicate the recorded information to the utility that provides service to the building. Thedata receiving module 202 can receive the recorded consumption information and correlate the energy usage with other types of data (e.g., thermostat data, exterior weather data) to determine how changes in outside weather conditions and adjustment of the thermostat settings impact energy consumption. - The
data receiving module 202 consolidates and aggregates the received information into a format conducive for storage in thedata storage 204 and processing by themodules data receiving module 202 is connected may transmit data using a different syntax and/or data structure. Thedata receiving module 202 parses the incoming data according to an understanding of the source of the data and reformat the data so that it conforms to a syntax or structure acceptable to thedata storage 204 and themodules data receiving module 202. - The
data receiving module 202 communicates with thedata storage 204 to save and retrieve data received from external sources in preparation for transmitting the data to themodules data receiving module 202 transmits a notification to thecoefficient modeler 206 that the data has been stored in thedata storage 204 and is ready for processing by thecoefficient modeler 206. The notification includes a reference indicator (e.g., a database address) of the storage location of the data within thedata storage 204. - The
data storage 204 is a database or other similar data structure, including hardware (e.g., disk drives), software (e.g., database management programming) or both, that stores information received by thedata receiving module 202. Thedata storage 204 also provides data to themodules modules - The
coefficient modeler 206 is a module that retrieves information from thedata storage 208 and generates sets of thermal response coefficients associated with energy characteristics of a building. Themodeler 206 determines the location of the building (e.g., by retrieving the building's zip code). In some embodiments, themodeler 206 retrieves additional data associated with the building, such as physical structure of the building (e.g., construction materials), solar orientation and load, thermal mass, and wind infiltration. In some embodiments, themodeler 206 infers the physical structure of the building, solar orientation and load, thermal mass, and/or wind infiltration based on the location of the building. In some embodiments, themodeler 206 retrieves smart meter data associated with the building that has been collected by theserver computing device 102 from a smart meter installed at the building. In some embodiments, themodeler 206 extracts data from thedata storage 204 in the form of a comma-separated value (.csv) file. - Based on this information, the
modeler 206 determines a thermal profile for the building. Using the thermal profile in conjunction with the weather information for the location of the building, the current thermostat setting for the building, and other data associated with the building (e.g., smart meter data), themodeler 206 generates sets of thermal response coefficients based on the various characteristics that affect the heating/cooling of the building (e.g., thermal mass, solar loading, and wind infiltration) and the amount of energy consumed by the heating/cooling apparatus at the building. Each set of thermal response coefficients can be different, according to projections of the weather conditions at the location over a period of time (e.g., an hour, a day). Themodeler 206 ranks the sets of thermal response coefficients based on considerations of energy usage, forecast accuracy, occupant preferences, and the like. Themodeler 206 transmits the ranked thermal response coefficients to thedata storage 204 for use byother modules system 100. - The optimizing and
scheduling module 210 retrieves the ranked thermal response coefficients from thedata storage 204 along with additional information, such as the weather forecast associated with the location of the building and an occupant preference profile associated with the building. In some embodiments, the optimizing andscheduling module 210 also retrieves current and estimated energy prices (e.g., from thedata storage 204 or from an external data source such as a utility company). The optimizing andscheduling module 210 transmits the information to thepredictive outcome module 208. - The
predictive outcome module 208 generates a series of temperature set points for the thermostat (e.g., thermostat 106) for the building, based on the current and forecast weather conditions for that location and each set of thermal response coefficients. Thepredictive outcome module 208 also generates a power usage estimate, duty cycle, and indoor temperature forecast for the heating/cooling apparatus installed the building based on the series of temperature set points. In some embodiments, thepredictive outcome module 208 can also generate an estimated energy cost associated with the series of temperature set points by incorporating current energy prices into the determination. - The optimizing and
scheduling module 210 receives the series of temperature set points from thepredictive outcome module 208 and optimizes the results based on additional factors such as anticipated demand response events and/or occupant preferences. For example, if the weather forecast indicates that the exterior temperature will rise from 70°F at 8:30am to 90°F at 11:00am, the optimizing andscheduling module 210 determines that there will be an increased demand for energy to power air conditioning systems at that time. The optimizing andscheduling module 210 also determines that the price of energy will go up at that time. As a result, the optimizing andscheduling module 210 adjusts the series of temperature set points to provide additional cooling (i.e., pre-cool) to the home in the earlier part of the morning (e.g., 8:30am) so that the air conditioner in the home does not need to run as long at 11:00am when the exterior temperature is hotter. Also, the optimizing andscheduling module 210 understands that the price of energy at 8:30am is lower than the predicted cost at 11:00am, so an increased consumption of energy in the early morning achieves a cost savings versus consuming more energy at the later time of 11:00am. - Once the optimizing and
scheduling module 210 has adjusted the series of temperature set points, themodule 210 transmits the series of temperature set points to thedata storage 204. Thedata storage 204 transmits the series of temperature set points to the sendingmodule 214, which communicates the temperature set points to thethermostat 106 in the building. The temperature set points provide a schedule of target temperatures for thethermostat 106 for a given time period (e.g., one day). Thethermostat 106 can perform heating and/or cooling according to the schedule of temperature set points to achieve increased energy efficiency and anticipation of demand response events. - The
server computing device 102 also includes adata verification module 212. Thedata verification module 212 retrieves energy usage data for the building from a prior time period and compares the usage data to what was predicted by thesystem 100 for the same time period. For example, thedata verification module 212 retrieves the energy usage data (e.g., as provided by a smart meter or from a utility) for a customer's home on a particular day. Thedata verification module 212 also retrieves the predicted energy usage for the same day, based on the determinations performed by themodeler 206,predictive outcome module 208 and optimization andscheduling module 210. Thedata verification module 212 compares the two energy usage values (actual vs. predicted) to determine if any deviations occurred. Based on the comparison, thedata verification module 212 can provide energy usage savings data that can be presented to the customer (e.g., via the web interface module 216). In some embodiments, thedata verification module 212 determines energy savings using additional methodologies. For example, thedata verification module 212 can compare a building's energy usage between (i) a day where the optimization andscheduling module 210 did not adjust the temperature set point schedule for the building's thermostat and (ii) a day where the optimization andscheduling module 210 did adjust the temperature set point schedule. Thedata verification module 212 can produce charts and other reports showing the energy savings achieved when the optimization andscheduling module 210 is run. In addition, the comparison information generated by thedata verification module 212 is used to refine the coefficient models created by themodeler 206 to achieve greater accuracy and better efficiency. - The
server computing device 102 also includes aweb interface module 216. Theweb interface module 216 is configured to receive connection requests from client devices (e.g.,client device 108 inFIG. 1 ) and provide a portal for the client devices to access and update the thermal profile information associated with a building. For example, a homeowner can register with thesystem 100 and connect to theweb interface module 216 via a web browser on aclient device 108. Upon logging in, the homeowner is presented with a portal containing various information related to the current energy characteristics of his home, as well as interactive features that allow the homeowner to establish and change comfort preferences for the internal temperature of his home. In some embodiments, the portal includes a home energy audit function which leverages the data stored in the system 100 (e.g., thermal profile, energy usage, weather conditions) and compares the homeowner's dwelling with other buildings that share similar thermal and/or energy consumption characteristics. The homeowner can determine the relative energy usage of his home against other homes or buildings in his area. Based on the home energy audit, the portal can also provide a customized and prioritized list of suggestions for improving the energy efficiency of the building. -
FIG. 3 is a flow diagram of amethod 300 for optimizing and controlling the energy consumption of a building. Theserver computing device 102, using thecoefficient modeler 206, generates (302) a set of thermal response coefficients for a building based on energy characteristics of the building and weather data associated with the location of the building. Theserver computing device 102, using the optimization andscheduling module 210 and thepredictive outcome module 208, predicts (304) an energy response of the building based on the set of thermal response coefficients and forecasted weather conditions associated with the location of the building. - The
server computing device 102, using the optimization andscheduling module 210 and thepredictive outcome module 208, selects (306) minimal energy requirements of the building based on an energy consumption cost associated with the building. Theserver computing device 102, using the optimization andscheduling module 210 and thepredictive outcome module 208, determines (308) one or more temperature set points for the building based on the energy response and the minimal energy requirements. Theserver computing device 102, using thedata verification module 212, compares the previous day's energy usage for the building against the predicted energy usage provided by themodeler 206 and thepredictive outcome module 208 to determine energy usage deviations and potential energy savings. Theserver computing device 102, using the sendingmodule 214, transmits (310) the one or more temperature set points to athermostat 106 of the building. - In some embodiments, the techniques described herein are used to execute demand response events in conjunction with local or regional utilities and service providers. The predictive modeling and thermostat control features of the
system 100 can be leveraged to prepare for potential demand response events identified by the utilities, and shift energy consumption by buildings connected to the system from peak demand times to lower demand times - thereby reducing the energy demand load on the utilities and potentially providing energy to the buildings at a lower cost. - For example, based on the predictive modeling, temperature set point generation, and associated analysis, the
server computing device 102 determines that a certain amount of energy will be consumed by buildings connected to thesystem 100 over the course of the following day. Theserver computing device 102 also determines that, based on weather forecast information, there may be a peak demand event for energy during a two-hour window the following day (e.g., due to forecast low/high external temperatures or a forecast change in external temperature). Because theserver computing device 102 has identified an amount of energy that will be potentially used during that two-hour window, theserver computing device 102 can proactively adjust the temperature set points for some or all of the thermostats (e.g., thermostat 106) to reduce or eliminate consumption of energy by the buildings during the peak demand time. - Often, a utility does not have advance warning of a potential demand response event. For example, the utility may not anticipate a demand response event until one hour before the event begins. At the point when the utility becomes aware of the demand response event, the utility can inform the
server computing device 102 of the upcoming event. Based on its previous analysis, theserver computing device 102 can commit a particular amount of energy to the utility that will not be consumed by buildings of thesystem 100 during the demand response event. If the utility notifies thesystem 100 that the utility requires the committed amount of energy, theserver computing device 102 automatically transmits adjusted temperature set point schedules to the connected thermostats that reduce energy consumption by the amount of energy committed to the utility. - The
server computing device 102 can also adjust the temperature set point schedules of the thermostats to account for the reduced energy consumption while approximately maintaining the temperature desired by the occupant and/or specified in the schedule. For example, if theserver computing device 102 understands that thethermostat 106 will be adjusted to consume no energy during a demand response event (e.g., mid-afternoon on a summer day), theserver computing device 102 can adjust the temperature set point schedule for thethermostat 106 to pre-cool the building in advance of the demand response event so that the temperature of the building is at or near the originally-scheduled value during the event. The additional energy consumed by the pre-cooling does not occur during the demand response event - leading to reduced load on the utility and potential cost savings for the occupant. Plus, the building approximately maintains a desired/scheduled temperature during the event. - Several mathematical algorithms can be used in developing possible predictions of the energy consumed by buildings connected to the
system 100, as well as predicting the specific amount of energy devoted to the operation of HVAC. - In one embodiment, a building is represented as a grey-box system balancing the sensible energy of the entire indoor environment with the flow of energy through the envelope. This type of modeling accounts for heat diffusion through the walls, convection on the inner and outer walls, solar irradiance, infiltration, thermal mass, and HVAC system performance. HVAC status data is obtained from internet connected thermostats, and electricity data from smart meters.
- Transient temperatures within the wall are accounted for by solving for the temperatures at nodes within a uniform property wall using an explicit tridiagonal matrix algorithm. Inputs to the model include outdoor temperature, solar insolation, and wind speed data from local weather stations, indoor air temperature, and HVAC status data from internet connected thermostats, and electricity data from smart meters. Instead of requiring detailed measurements of building characteristics such as insulation R-values and fenestration ratios, effective parameter values are calculated from the data.
- The exemplary solution technique consists of using a Genetic Algorithm to obtain a least squares curve that fits the modeled indoor air temperatures to the measured temperatures. The parameters are updated periodically to account for changes in the weather and building status. Energy forecasts are made by running the model with weather forecast data, user thermostat set points, and in the case of demand response events, updated set points to reflect the particular strategy proposed to be deployed.
- The power required to run standard air conditioners is generally dependent on the outdoor air temperature. Air conditioners utilize a vapor compression cycle and achieve cooling by absorbing heat from the indoor environment in the evaporator and rejecting it outside in the condenser. To get this heat transfer in the condenser, the refrigerant needs to be hotter than the outdoor air. Modern systems then compensate for variable outdoor air temperatures by adjusting the difference in pressure between the evaporator and condenser. When the outdoor temperature rises, this pressure differential (i.e., pressure ratio) needs to increase, requiring more power by the compressor. The same power variability with outdoor temperature is also observed in heat pumps.
- This temperature dependence is important for predicting air conditioner load, and can be measured using thermostat and smart meter power data. An exemplary method has been developed that matches the smart meter data with HVAC ON/OFF time periods to determine approximate HVAC ON power spikes. These power spikes are binned by their outdoor air temperature. Then a linear regression of the binned data is used to create an HVAC power curve. This power curve can be used to approximate the load anytime the HVAC is on given outdoor temperature data or forecasts.
-
FIG. 4 is a diagram showing power usage and temperature readings as determined by predictions of thesystem 100 in comparison to actual power usage and temperature readings for an example building over an example time period. In the graph ofFIG. 4 ,line 402 represents the average actual power usage,line 404 represents the average power usage prediction as determined by thesystem 100,line 406 represents the average actual indoor temperature andline 408 represents the average indoor temperature prediction as determined by thesystem 100. The data depicted inFIG. 4 was captured during a demand response event. As shown inFIG. 4 , the techniques described herein provide accurate predictions of demand response capacity and the impact of demand response on indoor house temperatures. The deviations between actual and predicted values for both power (e.g., 402, 404) and indoor temperature (e.g., 406, 408) are small and demonstrate the effectiveness of thesystem 100 in providing accurate predictions. - The above-described techniques can be implemented in digital and/or analog electronic circuitry, or in computer hardware, firmware, software, or in combinations of them. The implementation can be as a computer program product, i.e., a computer program tangibly embodied in a machine-readable storage device, for execution by, or to control the operation of, a data processing apparatus, e.g., a programmable processor, a computer, and/or multiple computers. A computer program can be written in any form of computer or programming language, including source code, compiled code, interpreted code and/or machine code, and the computer program can be deployed in any form, including as a stand-alone program or as a subroutine, element, or other unit suitable for use in a computing environment. A computer program can be deployed to be executed on one computer or on multiple computers at one or more sites.
- Method steps can be performed by one or more processors executing a computer program to perform functions of the invention by operating on input data and/or generating output data. Method steps can also be performed by, and an apparatus can be implemented as, special purpose logic circuitry, e.g., a FPGA (field programmable gate array), a FPAA (field-programmable analog array), a CPLD (complex programmable logic device), a PSoC (Programmable System-on-Chip), ASIP (application-specific instruction-set processor), or an ASIC (application-specific integrated circuit), or the like. Subroutines can refer to portions of the stored computer program and/or the processor, and/or the special circuitry that implement one or more functions.
- Processors suitable for the execution of a computer program include, by way of example, both general and special purpose microprocessors, and any one or more processors of any kind of digital or analog computer. Generally, a processor receives instructions and data from a read-only memory or a random access memory or both. The essential elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and/or data. Memory devices, such as a cache, can be used to temporarily store data. Memory devices can also be used for long-term data storage. Generally, a computer also includes, or is operatively coupled to receive data from or transfer data to, or both, one or more mass storage devices for storing data, e.g., magnetic, magneto-optical disks, or optical disks. A computer can also be operatively coupled to a communications network in order to receive instructions and/or data from the network and/or to transfer instructions and/or data to the network. Computer-readable storage mediums suitable for embodying computer program instructions and data include all forms of volatile and non-volatile memory, including by way of example semiconductor memory devices, e.g., DRAM, SRAM, EPROM, EEPROM, and flash memory devices; magnetic disks, e.g., internal hard disks or removable disks; magneto-optical disks; and optical disks, e.g., CD, DVD, HD-DVD, and Blu-ray disks. The processor and the memory can be supplemented by and/or incorporated in special purpose logic circuitry.
- To provide for interaction with a user, the above described techniques can be implemented on a computer in communication with a display device, e.g., a CRT (cathode ray tube), plasma, or LCD (liquid crystal display) monitor, for displaying information to the user and a keyboard and a pointing device, e.g., a mouse, a trackball, a touchpad, or a motion sensor, by which the user can provide input to the computer (e.g., interact with a user interface element). Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback, e.g., visual feedback, auditory feedback, or tactile feedback; and input from the user can be received in any form, including acoustic, speech, and/or tactile input.
- The above described techniques can be implemented in a distributed computing system that includes a back-end component. The back-end component can, for example, be a data server, a middleware component, and/or an application server. The above described techniques can be implemented in a distributed computing system that includes a front-end component. The front-end component can, for example, be a client computer having a graphical user interface, a Web browser through which a user can interact with an example implementation, and/or other graphical user interfaces for a transmitting device. The above described techniques can be implemented in a distributed computing system that includes any combination of such back-end, middleware, or front-end components.
- The components of the computing system can be interconnected by transmission medium, which can include any form or medium of digital or analog data communication (e.g., a communication network). Transmission medium can include one or more packet-based networks and/or one or more circuit-based networks in any configuration. Packet-based networks can include, for example, the Internet, a carrier internet protocol (IP) network (e.g., local area network (LAN), wide area network (WAN), campus area network (CAN), metropolitan area network (MAN), home area network (HAN)), a private IP network, an IP private branch exchange (IPBX), a wireless network (e.g., radio access network (RAN), Bluetooth, Wi-Fi, WiMAX, general packet radio service (GPRS) network, HiperLAN), and/or other packet-based networks. Circuit-based networks can include, for example, the public switched telephone network (PSTN), a legacy private branch exchange (PBX), a wireless network (e.g., RAN, code-division multiple access (CDMA) network, time division multiple access (TDMA) network, global system for mobile communications (GSM) network), and/or other circuit-based networks.
- Information transfer over transmission medium can be based on one or more communication protocols. Communication protocols can include, for example, Ethernet protocol, Internet Protocol (IP), Voice over IP (VOIP), a Peer-to-Peer (P2P) protocol, Hypertext Transfer Protocol (HTTP), Session Initiation Protocol (SIP), H.323, Media Gateway Control Protocol (MGCP), Signaling System #7 (SS7), a Global System for Mobile Communications (GSM) protocol, a Push-to-Talk (PTT) protocol, a PTT over Cellular (POC) protocol, and/or other communication protocols.
- Devices of the computing system can include, for example, a computer, a computer with a browser device, a telephone, an IP phone, a mobile device (e.g., cellular phone, personal digital assistant (PDA) device, laptop computer, electronic mail device), and/or other communication devices. The browser device includes, for example, a computer (e.g., desktop computer, laptop computer) with a World Wide Web browser (e.g., Microsoft® Internet Explorer® available from Microsoft Corporation, Mozilla® Firefox available from Mozilla Corporation). Mobile computing device include, for example, a Blackberry®. IP phones include, for example, a Cisco® Unified IP Phone 7985G available from Cisco Systems, Inc, and/or a Cisco® Unified Wireless Phone 7920 available from Cisco Systems, Inc.
- Comprise, include, and/or plural forms of each are open ended and include the listed parts and can include additional parts that are not listed. And/or is open ended and includes one or more of the listed parts and combinations of the listed parts.
- One skilled in the art will realize the invention may be embodied in other specific forms without departing from the essential characteristics thereof. The foregoing embodiments are therefore to be considered in all respects illustrative rather than limiting of the invention described herein.
Claims (15)
- A method for optimizing and controlling the energy consumption of a building, the method characterized by comprising:generating, by a first computing device, a plurality of thermal response coefficient sets for the building based on energy characteristics of the building and weather data associated with the location of the building, wherein each thermal response coefficient set is generated for a different projection of weather conditions at the location of the building for a given time period, including:receiving, by the first computing device, an indoor air temperature of the building;inferring, by the first computing device, physical structure data of the building based upon the location of the building;determining, by the first computing device, a transient temperature within one or more walls of the building based upon indoor air temperature and the weather data associated with the location of the building; andadjusting, by the first computing device, the physical structure data based upon the transient temperature; andgenerating, by the first computing device, the plurality of thermal response coefficient sets for the building based upon the adjusted physical structure data;predicting, by the first computing device, energy responses of the building, each energy response based on a different set of thermal response coefficients;selecting, by the first computing device, minimal energy requirements of the building based on an energy consumption cost associated with the building;determining, by the first computing device, a series of temperature set points for the building based on each predicted energy response and the minimal energy requirements; andtransmitting, by the first computing device, the series of temperature set points to a thermostat of the building.
- The method of claim 1, wherein the physical structure data comprises at least one of: thermal mass, wind infiltration, relative area of windows, amount of insulation, material of construction, wind infiltration of the building, or efficiency of an associated HVAC system.
- The method of claim 1, further comprising ranking, by the first computing device, the predicted energy responses based on predetermined criteria.
- The method of claim 1, wherein predicting energy responses is further based on the energy consumption cost associated with the building, wherein the energy consumption cost represents an amount of power required to change an indoor temperature of the building for various external temperatures.
- The method of claim 1, wherein the energy characteristics comprise an indoor temperature of the building and a status of an HVAC system in the building, wherein the HVAC system includes one or more stage heating or cooling units.
- The method of claim 1, wherein the minimal energy requirements comprise a power consumption amount of an HVAC system in the building and a duty cycle of the HVAC system.
- The method of claim 1, wherein determining the series of temperature set points is further based on a comfort preference provided by an occupant of the building.
- The method of claim 1, further comprising controlling, by the thermostat, use of temperature-affecting devices in the building based on the series of temperature set points.
- A computerized system for optimizing and controlling the energy consumption of a building, characterized by the following features:
the system characterized by comprising a first computing device configured to:generate a plurality of thermal response coefficient sets for the building based on energy characteristics of the building and weather data associated with the location of the building, wherein each thermal response coefficient set is generated for a different projection of weather conditions at the location of the building for a given time period, including:receiving an indoor air temperature of the building;inferring physical structure data of the building based upon the location of the building;determining a transient temperature within one or more walls of the building based upon indoor air temperature and the weather data associated with the location of the building; andadjusting the physical structure data based upon the transient temperature; andgenerating the plurality of thermal response coefficient sets for the building based upon the adjusted physical structure data;predict energy responses of the building, each energy response based on a different set of thermal response coefficients;select minimal energy requirements based on an energy consumption cost associated with the building;determine a series of temperature set points for the building based on each predicted energy response and the minimal energy requirements; andtransmit the series of temperature set points to a thermostat of the building. - The system of claim 9, wherein the physical structure data comprises at least one of: thermal mass, wind infiltration, relative area of windows, amount of insulation, material of construction, wind infiltration of the building, or efficiency of an associated HVAC system.
- The system of claim 9, wherein predicting energy responses is further based on the energy consumption cost associated with the building, wherein the energy consumption cost represents an amount of power required to change a temperature of the building for various external temperatures.
- The system of claim 9, wherein the energy characteristics comprise an indoor temperature of the building and a status of an HVAC system in the building, wherein the HVAC system includes one or more stage heating or cooling units.
- The system of claim 9, wherein determining the series of temperature set points is further based on weather forecast data, a comfort preference provided by an occupant of the building, or both.
- The system of claim 9, wherein the selected minimal energy requirements are based on at least a comfort preference provided by an occupant of the building and a second computing device is configured to:determine a second series of temperature set points that change the energy response of the building to use less energy and diverge from the comfort preference; andtransmit the determined second series of temperature set points to the thermostat of the building.
- The system of claim 9, wherein when determining a series of temperature set points, the first computing device is further configured to:update the energy responses based upon subsequent changes to the weather data;determine an updated series of temperature set points for the building based upon the updated energy responses; andtransmit the updated series of temperature set points to the thermostat.
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